Documents     
The AS46AAP-N10 is a closed-loop stepper system using a resolver for feedback. Thanks to closed loop control, there is no loss of synchronism. There is no lost synchronism even when subjected to abrupt load fluctuation or acceleration. A newly developed rotor position detection sensor constantly monitors the motor movement. If synchronism is about to be lost, closed loop control is used, so there is no need to worry about loss of steps.
Documents
AS46AAP-N10 Catalog